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Wellington Road South CSO: sewage overflow history

Review available Environment Agency annual monitoring returns for Wellington Road South CSO. Compare reported spill counts, total duration and monitor operation by year, with source details and gaps in the series identified.

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Annual monitoring returns

2021

2022

2023

2024

2025

Year	Counted spills	Total spill duration (hours)	Monitor operation (%)
2025	50	115.37	66.85
2024	57	105.34	99.94
2023	86	186.65	99.98
2022	63	108.74	100
2021	68	181.12	99.99

Published record details

Reference: UUP02072
Location: Mersey (upstream of Manchester Ship Canal)
Coordinates: 53.40959, -2.16241
Watercourse: River Mersey
Sewerage company: United Utilities
Asset type: SO on sewer network
Permit reference: 016982671
Discharge grid reference: SJ8930190321
Reporting years: 2025, 2024, 2023, 2022, 2021
Catchment: Mersey (upstream of Manchester Ship Canal)

Location

Wellington Road South CSO
53.40959, -2.16241

Understanding annual storm overflow figures

The Environment Agency's annual returns report storm overflow monitoring information supplied by water companies. Spill counts use the regulatory 12/24-hour block method, so a counted spill is not necessarily a single uninterrupted discharge. Duration is the reported total time in spill, rather than the volume of sewage discharged. Monitor operation indicates the percentage of the reporting period for which the monitor operated. Missing values, incomplete monitoring and changes in recorded outlet details can affect comparisons between years. These annual figures describe historical reporting periods, not live discharge conditions or the cause of sewage problems at an individual property.

Nearby records

Chestergate CSO 431A30 km Great Underbank CSO 43200 Stk00390.2 km Chestergate/King Street West CSO0.3 km Princes Street CSO0.3 km Hope Street Combined Sewer Overflow0.5 km

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